my local hardware store is selling 35 kg bags for 4 bucks premixed. love this economy. any advice on if this shit will work? and how many bags for a classic barrier spot? and should i use gravel/ dirt to put under? thanks..

are you just trying to cement a single barrier or a couple? i guess it depends on how much you are trying to cement, but what malinas said should have you covered eitherway. if you can find stones and debris to use as filler, your cement will go further too. being sparing with the water...the less, the better. if you use too much water, your cement will be runny and thus hard to work with. it will also become brittle when it dries. if you can find a pushed back barrier, that is your best bet too. if you have a car, you can try to push it back yourself (depending on how sturdy your car is. if you push it back with your car, try putting stuff under the barrier before bringing your back forward...but be careful, don't get yourself trapped under a barrier.

You could even make your "transitions" first.....fill in with whatever you have.....

You wanna generally keep cement 4 inches thick......

You don't need to know the weight.....each bag gives you a rough idea of the area it covers. Get out you calculaters and guesstimate how much area you need to fill at 4 inches high, X and Y for the other length and width. Then you can figure out how many bads you need.

we dont have any of those deer men in canada, they migrate to austrailia in the summer.

and i dunno how quickly i can do it, never done one. but hopefully with a little common sense and a few friends along it shouldnt take too long. and fyi: apart from our winters in canada, its actually a sick place to skate because no one ever enforces pads or any shit on our outdoor parks. lived in cali and i dont think theres one park i went to there that allowed no pads.